It's made of organic cotton fabric; Elastic waist and ribbed legs; Product Content and Features Product Content: Main Fabric Pajamas Bottom: 100% Cotton 100% Cotton Main Fabric Pajamas Top: 100% Cotton 100% Cotton Product Features: Pattern: Printed / Patterned Sleeve Length: Short Sleeve Product Type: Pajamas Suit Collar: Cycling. Collar Fabric: Combed Comb Material: Organic Cotton Gender: Boy